B.F. Mahn & Sons Inc. is Here For All Your Comfort System Service & Repair Needs

B. F. Mahn & Sons, Inc. in De Soto, MO provides commercial and residential plumbing and HVAC services. We are proud to serve customers across Jefferson County. Since 1868, our family-owned and operated business has been the name homeowners and business owners trust with all of their heating and plumbing needs, as well as bathroom remodeling services.

We offer competitive pricing, a full range of products, and exceptional customer service. From routine maintenance to urgent problems, you can trust our team of certified licensed plumbing and mechanical contractors. We work hard to provide the latest state of the art products and services and keep current through continuing education courses.

Heating Services

Our team of heating repair contractors are always available to make sure your heating or hot water systems are running at peak efficiency. We service and repair all types, makes, and models of heating systems including: gas, propane, geothermal, and electric. No matter if you're looking for routine maintenance or are in a heating emergency, we have the skills and expertise to make sure your system is in working order.

Furnace Maintenance, Repair, Installation & Replacement

Boiler Maintenance, Repair, Installation & Replacement

Radiant System Maintenance, Repair, Installation & Replacement

Geothermal System Maintenance, Repair, Installation & Replacement

Heat Pump Maintenance, Repair, Installation & Replacement

Ductless System Maintenance, Repair, Installation & Replacement

Air Conditioning Services

Whether you need your air conditioning system serviced, repaired, or tuned up, we have the skills and expertise to handle the job. Our team of trained contractors can service any make or model of air conditioner and will expertly diagnose and repair the issue. We can also help you prolong the life of your unit through preventative maintenance services. Additionally, if you're looking to reduce your energy bills, we can help you choose the right energy efficient air conditioning unit for your home or business.

Air Conditioner Maintenance, Repair, Installation & Replacement

Geothermal System Maintenance, Repair, Installation & Replacement

Heat Pump Maintenance, Repair, Installation & Replacement

Ductless System Maintenance, Repair, Installation & Replacement

Water Heater Services

While a water heater is a must-have appliance in your home, service or replacement doesn't really come to mind until it is too late. There is no need to panic if your water heater stops working. Our team of technicians will guide you through the process of repairing or purchasing a new water heater. We will work to diagnose the problem, and if your unit needs replacement, we will work with you to find the model to fit your needs.

Plumbing Services

B. F. Mahn & Sons have always been on the forefront of plumbing services. We have provided communities in Jefferson County with plumbing repair, maintenance, and replacement services for 4 generations, and guarantee you will receive the best possible service at a competitive price.

Blocked drains

Blocked sewer lines

Blocked shower drains

Burst/ leaky pipes

Gas leaks

Leaking hot-water unit

Other plumbing issues

Sewer backups

Tap doesn’t turn off

Water pressure problems

Duct Cleaning Services

Dirty HVAC systems and ducting can reduce indoor air quality and the efficiency of your heating and cooling systems. B.F. Mahn & Sons Inc. Duct Cleaning service addresses dirty ducting and HVAC systems to improve indoor air quality and maximize the efficiency of your comfort systems.

Enjoy cleaner, healthier air in your home!

Reduce respiratory illness by eliminating pollutants that cause them!

Service Plans

Your home's comfort systems are an investment in comfort. B.F. Mahn & Sons wants to make sure that your investment lasts as long as possible. That is why we offer maintenance agreements to ensure that your systems are getting the care they need to run year after year! Our team of knowledgable & dedicated technicians are ready to help you! Call today.

Save on energy bills with high efficiency and reliable comfort systems